AND PRESERVING SHELLS. 
103 
many of the land shells which inhabit trees 
and shrubs will occur while beating or search- 
ing for insects, and others will be found in 
damp places, and generally in the shade. The 
British species are very numerous. 
The collector should be provided with a 
canvas bag for the larger species, and a wide- 
mouthed bottle or tin box for the smaller; 
also with one or two oyster knives for separat- 
ing the PatellcBySic. from the rocks. Pholas, 
&c. will require a hammer and chisel, to cut 
them out of stones and wood. A landing net 
with very small meshes, or the net used in 
fishing for insects, and a small spade to dig 
out those which bury in the sand, will also 
be necessary. 
Bivalve Shells (muscles, oijsters, cockles, 
&c.) are of little comparative value unless 
perfect. Both valves should be procured if 
possible, and care should be taken not to 
separate them. Some of the univalve shells 
have their whorls reversed, and are much 
sought after, and often bear a high price. The 
opercula or lids which close the mouths of 
some of the univalves should always be pre- 
served. 
Varieties both in size and colour should be 
procured as far as possible, and the traveller 
